Let us notice that the above boundary masses as well as mentioned processes related to the substellar formation depend on the interior structure, first-order phase transition, opacity and atmosphere model [1]}, as well as modified gravity [2]}, [3]}, [4]}, [5]}, [6]}, [7]}, [8]}, [9]}, [10]}, [11]}, [12]}. Moreover, massive brown dwarfs can burn deuterium as well as lithium and even hydrogen in their cores, however those processes are neither stable nor energetic enough to stop the gravitational contraction. Therefore, they continue shrinking, radiating the stored energy away and cooling down with time. The contraction stops on the onset of the electron degeneracy.
